Robert M. Pettigrew
28Patents
18h-index
31Co-inventors
81Inventor score
Filing activity: Mar 6, 1975 → Mar 10, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4931384A | Optical assay technique | Emerging Cross-Sectional Technologies | 193 | Expired |
| US5160943A | Printing systems | Performing Operations; Transporting | 146 | Expired |
| US6489899B1 | Position detector | Physics | 145 | Expired |
| US7030782B2 | Position detector | Physics | 130 | Expired |
| US5118608A | Optical assay technique | Emerging Cross-Sectional Technologies | 126 | Expired |
| US6624916B1 | Signalling system | Electricity | 123 | Expired |
| US6249234A | Position detector | Physics | 112 | Expired |
| US4940966A | Article detection and/or recognition using magnetic devices | Emerging Cross-Sectional Technologies | 92 | Expired |
| US4960651A | Magnetic devices | Emerging Cross-Sectional Technologies | 87 | Expired |
| US4776701A | Displacement measuring apparatus and method | Physics | 61 | Expired |
| US4486870A | Optical data storage | Physics | 46 | Expired |
| US5149211A | Printers and ancillary systems | Physics | 37 | Expired |
| US4703469A | Optical data recording using radiation of different characteristics | Physics | 29 | Expired |
| US4051367A | Measurement apparatus | Physics | 24 | Expired |
| US4616237A | Data storage medium | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5877800A | Optical data recording apparatus and method | Physics | 21 | Expired |
| US4893299A | Magneto-optic data storage technique | Physics | 21 | Expired |
| US4636076A | Displacement measuring apparatus and method | Physics | 19 | Expired |
| US4049965A | Measurement apparatus | Physics | 12 | Expired |
| US4928132A | Optical data storage medium | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4657780A | Manufacture of diffraction gratings | Physics | 8 | Expired |
| US4522482A | Information storage and retrieval | Physics | 8 | Expired |
| US4758307A | Method of manufacturing a data storage medium | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4724444A | Data storage medium | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4541695A | Zoom lens for cameras | Physics | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.